Journal cover Journal topic
Ocean Science An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/os-2017-55
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
27 Jun 2017
Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Ocean Science (OS).
Combining physical and geochemical methods to investigate lower halocline water formation and modification along the Siberian continental slope
Matthew B. Alkire1, Igor Polyakov2, Robert Rember2, Andrey Pnyushkov2, Vladimir Ivanov3,2, and Igor Ashik3 1Applied Physics Laboratory, University of Washington, Seattle, WA USA
2International Arctic Research Center, University of Alaska Fairbanks, Fairbanks, AK USA
3Arctic and Antarctic Research Institute, St. Petersburg, RUS
Abstract. A series of cross-slope transects were occupied in 2013 and 2015 that extended eastward from St. Anna Trough to the Lomonosov Ridge. High-resolution physical and chemical observations collected along these transects revealed fronts in the potential temperature and the stable oxygen isotopic ratio (δ18O) that were observed north of Severnaya Zemlya (SZ). Using linear regressions, we describe mixing regimes on either side of the front that characterize the convective formation of lower halocline water (LHW) and the cold halocline layer. Initial freshening of Atlantic water by sea-ice meltwater occurs west of SZ whereas higher influences of meteoric water and brine result in a transition to a separate mixing regime that alters LHW through mixing with overlying waters and shifts the characteristic temperature-salinity bend from higher (34.4 ≤ S ≤ 34.5) toward lower (34.2 ≤ S ≤ 34.3) salinities. These mixing regimes appear to have been robust since at least 2000.

Citation: Alkire, M. B., Polyakov, I., Rember, R., Pnyushkov, A., Ivanov, V., and Ashik, I.: Combining physical and geochemical methods to investigate lower halocline water formation and modification along the Siberian continental slope, Ocean Sci. Discuss., https://doi.org/10.5194/os-2017-55, in review, 2017.
Matthew B. Alkire et al.
Matthew B. Alkire et al.

Data sets

NABOS - CTD Survey Data 2013
I. Polyakov
https://doi.org/10.18739/A2M37F
NABOS - Water Quality and Physical Oceanography Data from the Eastern Eurasian and Makarov Basins, and Northern Laptev and East Siberian Seas in 2013
I. Polyakov
https://doi.org/10.18739/A2G95H
Chemistry Data 2013
I. Polyakov
https://doi.org/10.18739/A2QS91
NABOS II - Water Quality and Physical Oceanography Data from the Eastern Eurasian and Makarov Basins, and Northern Laptev and East Siberian Seas in 2013 - 2015
I. Polyakov
https://doi.org/10.18739/A20955
CTD Survey Data 2015
I. Polyakov
https://doi.org/10.18739/A2436Q
Chemistry Data 2015
Igor Polyakov
https://doi.org/10.18739/A27S9P
Matthew B. Alkire et al.

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Short summary
High-resolution measurements of temperature, salinity, and the stable oxygen isotope ratio of seawater were collected along the slopes of the Barents, Kara, and Laptev Seas during late summer of 2013 and 2015. Two separate mixing regimes were identified that describe the initial and final stages of halocline water formation. The linear regressions defining the mixing regimes appear to be stable despite the dramatic environmental changes observed over the Arctic Ocean over the past two decades.
High-resolution measurements of temperature, salinity, and the stable oxygen isotope ratio of...
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